getMessage.js
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/*!
* Chai - message composition utility
* Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
* MIT Licensed
*/
/*!
* Module dependancies
*/
var flag = require('./flag')
, getActual = require('./getActual')
, inspect = require('./inspect')
, objDisplay = require('./objDisplay');
/**
* ### .getMessage(object, message, negateMessage)
*
* Construct the error message based on flags
* and template tags. Template tags will return
* a stringified inspection of the object referenced.
*
* Message template tags:
* - `#{this}` current asserted object
* - `#{act}` actual value
* - `#{exp}` expected value
*
* @param {Object} object (constructed Assertion)
* @param {Arguments} chai.Assertion.prototype.assert arguments
* @name getMessage
* @api public
*/
module.exports = function (obj, args) {
var negate = flag(obj, 'negate')
, val = flag(obj, 'object')
, expected = args[3]
, actual = getActual(obj, args)
, msg = negate ? args[2] : args[1]
, flagMsg = flag(obj, 'message');
if(typeof msg === "function") msg = msg();
msg = msg || '';
msg = msg
.replace(/#{this}/g, objDisplay(val))
.replace(/#{act}/g, objDisplay(actual))
.replace(/#{exp}/g, objDisplay(expected));
return flagMsg ? flagMsg + ': ' + msg : msg;
};